Your florist cancelled on you ?? Whaaat ??? Are you having an outside ceremony ? If yes then that chupah on the pic is perfect !!! You can tie the flowers to the poles with some kind of a metal wire or a strong rope. I love the vines going down the poles, deffinately incorporate that.

How about using fake flowers? that way you can do it in advance and get it just right. Plus if thier 7 feet up in the air you wont see a major difference btwn real and fake. I think you can get fake flowers with bendy stems to wrap around the chuppah, if not just get some florists wire and wray it around the flower stem, then wrap that around the chuppah pole. Have fun!